Process characteristics of single-end pipe bending machine

The single-head pipe bending machine performs the same twists and turns of the pipe as the twists of the sheet. In the case of pure tortuousness, when the tube with an outer diameter of D and a wall thickness of D is tortuous under the effect of the external moment M, the outer tube wall of the neutral layer is subjected to the effect of tensile stress 01, and the tube wall becomes thin; the inner tube wall of the neutral layer The effect of tensile stress 01 makes the pipe wall thicker. And the shape of the cross-section changes from a circle to an ellipse due to the effect of the combined forces F1 and F2. When the deformation is too large, the outer tube wall will crack and the inner tube wall will wrinkle.
The degree of deformation of the single-end pipe bending machine pipe depends on the relative bending radius R/D and the relative thickness t/D. The smaller the R/D and t/D values, the greater the degree of deformation. In order to ensure the forming quality of the pipe fittings of the single-end pipe bender, it is necessary to control the degree of deformation within a reasonable range. The bending forming limit of the pipe not only depends on the mechanical properties and tortuous methods of the raw material, but also relates to the application requirements of the pipe. The forming limit of the pipe fittings of the single-end pipe bending machine should include the following contents:
1) The elongation deformation in the tensile deformation zone outside the neutral layer does not exceed the allowable value of the plasticity of the material and breaks;
2) In the compression deformation zone inside the neutral layer, the part of the thin-walled structure affected by the tangential compressive stress will not exceed the instability and wrinkle;
3) If the pipe fittings of the single-head pipe bender have ellipticity requirements, the control section will be distorted;
4) If the pipe has a strength requirement to accept internal pressure, control the forming limit of its wall thickness reduction.
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